首页   按字顺浏览 期刊浏览 卷期浏览 Mechanical Behavior of Sapphire Whiskers at Elevated Temperatures
Mechanical Behavior of Sapphire Whiskers at Elevated Temperatures

 

作者: S. S. Brenner,  

 

期刊: Journal of Applied Physics  (AIP Available online 1962)
卷期: Volume 33, issue 1  

页码: 33-39

 

ISSN:0021-8979

 

年代: 1962

 

DOI:10.1063/1.1728523

 

出版商: AIP

 

数据来源: AIP

 

摘要:

The tensile behavior of sapphire whiskers was measured at temperatures ranging from 25–2030°C. At room temperature, the tensile strength of the whiskers is size dependent and varies from several hundred thousand psi to 1 500 000 psi. With increasing temperature the strength decreases and becomes less size dependent. The whiskers exhibit delayed fracture above 630°C, the time to fracture being exponentionally related to the applied stress. Delayed fracture occurs in both hydrogen and oxygen atmospheres and hence is not believed to be due to stress corrosion. The mechanical behavior of the whiskers has been rationalized by assuming that they are essentially dislocation free and that failure occurs by thermally activated crack propagation preceded, at high temperatures, by localized dislocation nucleation.

 

点击下载:  PDF (547KB)



返 回